OpenTelemetry NET, Denial of Service (DoS), CVE-2023-XXXX (Critical)

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How the Mentioned CVE Works:

The vulnerability (CVE-2023-XXXX) in the OpenTelemetry.Api package versions 1.10.0 to 1.11.1 arises due to improper handling of the `tracestate` and `traceparent` HTTP headers. When these headers are received by an application, even if trace context propagation is not explicitly used, the application experiences high CPU usage. This occurs because the header parsing logic in the affected versions inefficiently processes these headers, leading to excessive resource consumption. The issue impacts any web-accessible application or backend service that processes HTTP requests containing the `tracestate` header. This can result in increased latency, degraded performance, or complete downtime due to resource exhaustion, effectively causing a Denial of Service (DoS) condition.

DailyCVE Form:

Platform: OpenTelemetry .NET
Version: 1.10.0 to 1.11.1
Vulnerability: Denial of Service (DoS)
Severity: Critical
Date: 2023-XX-XX

(End of form)

What Undercode Say:

Exploitation:

1. Exploit Scenario: An attacker sends crafted HTTP requests with malformed `tracestate` and `traceparent` headers to a vulnerable application.

2. Payload Example:

GET / HTTP/1.1
Host: vulnerable-app.com
traceparent: 00-0af7651916cd43dd8448eb211c80319c-b7ad6b7169203331-01
tracestate: malformed_data_here

3. Impact: High CPU usage, leading to application unresponsiveness or downtime.

Protection:

1. Patch: Upgrade to OpenTelemetry.Api 1.11.2 or OpenTelemetry .NET Automatic Instrumentation 1.11.0.
2. Workaround: Implement a middleware to filter or sanitize `tracestate` and `traceparent` headers before processing.

   app.Use(async (context, next) =>
   {
   if (context.Request.Headers.ContainsKey("tracestate"))
   {
   context.Request.Headers.Remove("tracestate");
   }
   await next();
   });
   

3. Monitoring: Use monitoring tools to detect unusual CPU spikes caused by HTTP requests.

Analytics:

1. Affected Versions:

• OpenTelemetry.Api: 1.10.0 to 1.11.1
• OpenTelemetry .NET Automatic Instrumentation: 1.10.0-beta.1, 1.10.0

2. Fixed Versions:

• OpenTelemetry.Api: 1.11.2
• OpenTelemetry .NET Automatic Instrumentation: 1.11.0

Commands:

1. Check Installed Version:

dotnet list package --include-transitive

2. Upgrade Command:

dotnet add package OpenTelemetry.Api --version 1.11.2

References:

1. bash
2. bash
3. bash

Detection:

1. Log Analysis: Monitor logs for repeated requests with `tracestate` headers.
2. SIEM Rules: Create alerts for unusual HTTP header patterns.

Mitigation:

1. Rate Limiting: Implement rate limiting to prevent abuse.

2. Header Validation: Validate and sanitize incoming headers.

By following these steps, users can mitigate the risk of exploitation and ensure their systems remain secure.

References:

Reported By: https://github.com/advisories/GHSA-vc29-vg52-6643
Extra Source Hub:
Undercode

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